CN103363907A - Multi-path grating ruler signal acquiring and measuring system - Google Patents

Abstract

The invention discloses a multi-channel grating ruler signal acquisition and measurement system, comprising a grating ruler, a multi-channel grating signal acquisition and measurement device and a computer data acquisition and processing system, wherein multiple grating rulers pass through the grating ruler signal line and the multi-channel grating signal acquisition and measurement device The multi-channel grating signal acquisition and measurement device is connected to the computer data acquisition and processing system through the signal output connection line and the high-speed connection serial port. The invention can connect grating scales with different resolutions and ranges, and only needs to be set in the computer data acquisition and processing system; ARM high-speed processing module is adopted; the system adopts computer control, the test accuracy can reach 0.1 μm, and the operation is simple; multiple acquisition The measuring devices can be connected in series through the serial port, and by setting the chassis number of each collecting and measuring device, the connection of one computer to multiple collecting and measuring devices can be realized; The plug can be easily inserted into the acquisition and measurement device.

Description

Multi-channel grating ruler signal acquisition and measurement system

technical field

The invention relates to an automatic collection and analysis system for displacement data, in particular to a multi-channel grating ruler signal collection and measurement system with built-in miniature multi-point displacement data in a flexible transfer type used in geomechanics model tests.

Background technique

At present, there are many kinds of multi-point displacement test methods used in actual engineering sites at home and abroad, but the miniature multi-point displacement test system used in geomechanics model test is still rare.

A relatively successful example in China is the differential transformer-type multi-point displacement test system invented by Professor Li Zhongkui of Tsinghua University, and applied to the geomechanical model test of the cavern group of Xiluodu Hydropower Station. The resistance sensor is used to measure the displacement, and the measurement accuracy can reach as high as 0.001mm, but the resistance sensor is easily affected by the external electromagnetic field and reduces the accuracy. Automatic data collection can be realized, but the automatic collection and analysis system of displacement data has unfriendly screen and simple functions.

The flexible transmission type built-in miniature multi-point displacement test system (application number 200810138975.5) invented by Professor Zhu Weishen of Shandong University for model testing uses a high-precision grating ruler as a displacement measuring instrument with an accuracy of less than 1 μm; the multi-point displacement meter is The flexible transmission type can test the displacement of the turning measuring point in the model test in real time; it has the advantages of convenient data collection and processing. But there are following disadvantages:

1. The signal conversion system and the data acquisition hardware system (data acquisition cabinet) are separated, and the connection of the data signal lines is inconvenient, which is not conducive to the accurate measurement of the displacement measurement results of the model test;

2. The signal acquisition and processing is carried out by PLC, and the response speed is slow. When the grating ruler moves fast, it is easy to lose frames, and the displacement measurement is inaccurate, which seriously affects the test results;

3. The interface of the data acquisition and analysis software system is relatively simple. It only has the functions of data clearing, data acquisition display and simple historical curve, and the sampling period cannot be adjusted.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a multi-channel grating ruler signal acquisition and measurement system with convenient operation, powerful functions, high precision and high-speed response.

To achieve the above object, the present invention adopts the following technical solutions:

A multi-channel grating ruler signal acquisition and measurement system, including a grating ruler, a multi-channel grating signal acquisition and measurement device and a computer data acquisition and processing system. The multi-channel grating signal acquisition and measurement device is connected to the computer data acquisition and processing system through the signal output connection line and the high-speed connection serial port.

The outside of the signal line of the grating ruler adopts a multi-layer isolated wire net and a metal soft shell, and the end of the signal line is provided with an aviation plug.

The panel of the multi-channel grating signal acquisition and measurement device is provided with a plurality of aviation sockets, and the aviation plug at the end of the grating ruler signal line is inserted into the aviation socket to connect the grating ruler and the multi-channel grating signal acquisition and measurement device.

The multi-channel grating signal acquisition and measurement device includes:

A high-speed photocoupler with a cut-off frequency of 20MHz is used for high-speed grating signal acquisition for the signal of the grating ruler;

Inverter, further shaping the raster signal collected by the high-speed photocoupler, to ensure that the raster signal before entering the high-speed data module of the ARM chip is clean and complete;

The ARM chip uses the high-speed quadrature encoding acquisition module QEI in the ARM chip to count, determine the direction and quadruple the frequency of the filtered and shaped signal after the raster signal is collected and shaped by the inverter;

Synchronous serial interface SSI, which sends the collected and processed data of each ARM chip to the main ARM chip;

The main ARM chip communicates with the computer data acquisition and processing system through the RS485 interface.

The computer data acquisition and processing system expands a plurality of high-speed serial ports for the MOXO multi-serial port card, and can connect to a plurality of acquisition boxes respectively.

The computer data collection and processing system of the present invention can set the parameters of a plurality of grating data collection boxes and perform data display, curve drawing, segmentation data storage, printing and the like on the collected displacement signals.

During the test of the present invention, the aviation plug of the data line of the multi-channel grating ruler is inserted into the jack of the acquisition instrument according to the corresponding relationship of the acquisition instrument number, the acquisition device and the computer are connected through the data line, and the displacement measurement can be performed by opening the computer data acquisition and processing system . The system can realize the following functions:

1. Can collect 8-way, 16-way or 32-way grating ruler signal data;

2. Record and archive the collected data in real time;

3. Archived data can be queried online and exported in EXCEL format;

4. History and time history curves containing archived data;

5. With data query function;

6. Control the user's operation authority through user management to prevent misoperation.

7. Data display, curve drawing, segmentation data saving, printing, etc. can be performed on the signals of multiple raster data acquisition boxes.

Compared with similar products at home and abroad, the present invention has the following significant technical advantages:

(1) It can connect grating rulers with different resolutions and ranges. It is set in the computer data acquisition and processing system. It is only necessary to insert the data cable plug of the grating ruler into the link socket of the console; it realizes the grating ruler signal conversion system, data acquisition, The unified combination of the analysis system can realize the real-time monitoring, storage and analysis of the displacement, and has the functions of data export, query and permission setting.

(2) Using ARM high-speed processing module, the sampling frequency is up to 20MHz, suitable for instantaneous dynamic displacement measurement and static displacement measurement; the system is controlled by computer, the test accuracy can reach 0.1μm, the interface is friendly, intuitive, and easy to operate.

(3) Each acquisition and measurement device can be set into different sampling channels such as 8 channels, 16 channels and 32 channels to meet different experimental requirements.

(4) Multiple acquisition and measurement devices can be connected in series through the serial port, and by setting the chassis number of each acquisition and measurement device, the connection of one computer to multiple acquisition and measurement devices can be realized;

(5) Each acquisition and measurement device is equipped with an aviation plug, and the aviation plug of the grating ruler data line can be easily inserted into the acquisition and measurement device. The flexible miniature multi-point displacement gauge matched with this system can be widely used in similar model tests of geomechanics.

Description of drawings

Fig. 1 is a schematic block diagram of the present invention;

1. Grating ruler, 2. Multi-channel grating signal acquisition and measurement device, 3. Aviation socket, 4. High-speed photocoupler, 5. Inverter, 6. ARM chip, 7. Synchronous serial interface SSI, 8. Main ARM chip, 9. RS485 interface, 10. High-speed connection serial port, 12. Computer data acquisition and processing system, 13. Grating ruler signal line, 14. Signal output connection line.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, a multi-channel grating ruler signal acquisition and measurement system includes a grating ruler 1, a multi-channel grating ruler signal acquisition and measurement device 2 and a computer data acquisition and processing system 12; multiple grating rulers 1 (up to 32 channels can be connected) The multi-channel grating signal acquisition and measurement device 2 is connected with the aviation socket 3 of the multi-channel grating signal acquisition and measurement device 2 through the grating ruler signal line 13; the multi-channel grating signal acquisition and measurement device 2 is connected with the computer data acquisition and processing system 12 through the signal output connection line 14 and the high-speed connection serial port 10;

The outside of the signal line of the grating ruler 1 adopts a multi-layer isolated wire mesh and a metal soft shell, and the end of the signal line adopts an aviation plug.

Multiple aviation sockets 3 are designed on the panel of the multi-channel grating signal acquisition and measurement device 2, and the aviation plug at the end of the signal line of the grating ruler 1 is inserted into the aviation socket 3 to connect the grating ruler 1 and the multi-channel grating signal acquisition and measurement device 2;

The cut-off frequency of the high-speed photocoupler 4 is as high as 20MHz, and the signal of the grating ruler 1 can be collected at a high speed, and then the collected grating signal can be further shaped by the inverter 5 to ensure the high-speed data entering the ARM chip 6 The grating signal before the module is clean and complete, which greatly improves the reliability and anti-interference of signal acquisition.

The ARM chip 6 uses the high-speed quadrature encoding acquisition module QEI in the ARM chip to count, determine the direction and quadruple the frequency of the filtered and integer-shaped signal on the grating signal processed by the signal acquisition and shaping part.

The function of the synchronous serial interface SSI7 is to send each piece of ARM chip 6 to the main ARM chip 8 through the synchronous serial interface SSI7 after collecting and processing the data.

The main ARM chip 8 communicates with the computer data acquisition and processing system 12 through the RS485 interface 9 . Among them, in the computer data acquisition and processing system 12, a plurality of high-speed connection serial ports 10 (1 to 4, 1 to 8, 1 to 16, etc.) can be connected to multiple collection boxes by utilizing the MOXO multi-serial port card produced in Taiwan.

The computer data acquisition and processing system 12 can set the parameters of multiple raster data acquisition boxes 2 and perform data display, curve drawing, segmentation data storage, printing, etc. on the acquired displacement signals.

During the test of the present invention, insert the aviation plug of the data line of the multi-channel grating scale into the jack of the acquisition instrument according to the corresponding relationship of the acquisition instrument number, connect the acquisition device and the computer data acquisition and processing system through the data line, and open the computer data acquisition The processing system is ready for displacement measurement. The system can realize the following functions:

1. Can collect 8-way, 16-way or 32-way grating ruler signal data;

2. Record and archive the collected data in real time;

3. Archived data can be queried online and exported in EXCEL format;

4. History and time history curves containing archived data;

5. With data query function;

6. Control the user's operation authority through user management to prevent misoperation.

7. Data display, curve drawing, segmentation data saving, printing, etc. can be performed on the signals of multiple raster data acquisition boxes.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (5)

1. A multi-channel grating ruler signal acquisition measurement system is characterized in that it comprises a grating ruler, a multi-channel grating ruler signal acquisition measuring device and a computer data acquisition and processing system, and a plurality of grating rulers are collected by the grating ruler signal line and the multi-channel grating ruler signal The aviation socket of the measuring device is connected, and the multi-channel grating signal acquisition measuring device is connected with the computer data acquisition and processing system through the signal output connection line and the high-speed connection serial port. 2. The system according to claim 1, characterized in that, the outside of the signal line of the grating ruler adopts a multi-layer isolated wire mesh and a metal soft shell, and the end of the signal line is provided with an aviation plug. 3. The system according to claim 2, characterized in that, the panel of the multi-channel grating signal acquisition and measurement device is provided with a plurality of aviation sockets, the aviation plug at the end of the grating ruler signal line is inserted into the aviation socket, and the grating ruler is inserted into the aviation socket. It is connected with a multi-channel grating signal acquisition and measurement device. 4. The system according to claim 1, wherein the multi-channel grating signal acquisition and measurement device comprises: A high-speed photocoupler with a cut-off frequency of 20MHz is used for high-speed grating signal acquisition for the signal of the grating ruler; Inverter, further shaping the raster signal collected by the high-speed photocoupler, to ensure that the raster signal before entering the high-speed data module of the ARM chip is clean and complete; The ARM chip uses the high-speed quadrature encoding acquisition module QEI in the ARM chip to count, determine the direction and quadruple the frequency of the filtered and shaped signal after the raster signal is collected and shaped by the inverter; Synchronous serial interface SSI, which sends the collected and processed data of each ARM chip to the main ARM chip; The main ARM chip communicates with the computer data acquisition and processing system through the RS485 interface. 5. The system according to claim 1, wherein the computer data collection and processing system expands a plurality of high-speed serial ports for the MOXO multi-serial port card, and can connect a plurality of collection boxes respectively.

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